Fix broken test in WebKit test suite and add the test in question to V8 tests...

src/runtime.cc

 // Copyright 2006-2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4951 matching lines @@
   year += month / 12;
   month %= 12;
   if (month < 0) {
     year--;
     month += 12;
   }
 
   ASSERT(month >= 0);
   ASSERT(month < 12);
 
-  static const int base_day = 365*1969 + 1969/4 - 1969/100 + 1969/400;
-  int year1 = year - 1;
-  int day_from_year = 365 * year1 + year1 / 4 - year1 / 100 + year1 / 400 -
+  // year_delta is an arbitrary number such that:
+  // a) year_delta = -1 (mod 400)
+  // b) year + year_delta > 0 for years in the range defined by
+  //    ECMA 262 - 15.9.1.1, i.e. upto 100,000,000 days on either side of
+  //    Jan 1 1970. This is required so that we don't run into integer
+  //    division of negative numbers.
+  // c) there shouldn't be overflow for 32-bit integers in the following
+  //    operations.
+  static const int year_delta = 399999;
+  static const int base_day = 365 * (1970 + year_delta) +
+                              (1970 + year_delta) / 4 -
+                              (1970 + year_delta) / 100 +
+                              (1970 + year_delta) / 400;
+
+  int year1 = year + year_delta;
+  int day_from_year = 365 * year1 +
+                      year1 / 4 -
+                      year1 / 100 +
+                      year1 / 400 -
                       base_day;
 
   if (year % 4 || (year % 100 == 0 && year % 400 != 0)) {
     return Smi::FromInt(day_from_year + day_from_month[month] + date - 1);
   }
 
   return Smi::FromInt(day_from_year + day_from_month_leap[month] + date - 1);
 }
 
 
@@ skipping 3414 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal